i really think you need to clarify the 'question(?)' more;
i think i understand; about the angles; i seen someone make templates of the burst; like a crude outline of the body, 2'3 of them gradually geting bigger.
they were raised from the body, so some of the paint would get under the template, making for a smoother transition; with most edges being painted, the angle your hitting is like aiming for the edge of the body, like spraying the corner;
and if this isnt any help; go to the tutorials and google; they might not tottally spell it out for you , but theres alot of pics and write ups that you should be able to put something together.